public key

One common hurdle Linux users might face when updating packages or installing new software using package managers like DNF, APT, and Zypper is the "no public key" error. This error typically occurs when the package manager cannot verify the authenticity of the packages due to missing or outdated GPG (GNU Privacy Guard) keys. This post will guide you through resolving these errors across various package managers. These errors happen when the package manager attempts to verify the digital signature of the package using a GPG key that is not available on your system. Each repository configures its own GPG key to ensure that the packages are secure and not tampered with.